The sum of the ages of Doris and Fred is y years. If Doris is 12 years older than Fred, how many years old will Fred be y years from now, in terms of y?
y-6
2y-6
~$\frac{y}{2}$~-6
~$\frac{3y}{2}$~-6
~$\frac{5y}{2}$~-6
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how many years old will Fred be y years from now? 还原成Fred will be how many years old y years from now?
how many years old will Fred be y years from now?
还原成Fred will be how many years old y years from now?
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